It's hard to comment because I think you delivered exactly what you advertised. You really nailed regret and that's not easy to do being a more subtle emotion.

Pay attention to the transitions between sounds and syllables to avoid any words getting lost within others, causing them to disappear. In terms of areas for improvement, the transition between sounds and syllables is crucial. If not done correctly, certain words or parts of words can get 'swallowed' or obscured, which can detract from the clarity of your message. This tends to happen particularly with complex or rapid speech. Focusing on articulating every sound in every word can help with this. You can practice this by slowly reading out a script, making sure every syllable and every consonant is clear, and then gradually increasing your speed while maintaining clarity. Enunciation is another area where you can focus. Make sure you are giving enough time and breath to each word. Over-enunciation exercises, where you exaggerate the pronunciation of each word, can be very useful in improving this skill. Moreover, consider recording yourself during practice sessions and then listen back. This can provide a lot of insight into areas where your enunciation or transitions between sounds might need more focus. As you listen, follow along with a script and mark any spots where your words were not clear. This will give you a target for where to focus your efforts in your practice. Remember, constant practice and self-awareness are key to improvement in voiceover work. Keep honing your skills and continue to breathe life into your characters with your unique touches. You're on the right track, and with continued effort, your delivery will become even more compelling and clear. Keep up the good work!